I discovered HootSuite last weekend, and I am loving it! I don't know how I ever got by without it, it just simplifies things so much!
I should be clear that I don't think that it should replace normal social media use, it should only be used as an added tool. For me, that means that I schedule a post or two on certain days for certain places, but then use social media as normal the rest of the time. This way, I can still re-post my friends material, without seeming like a spammer by over posting, but if there is ever a day when I can't get to my computer, I know I'm not absent all together. I just love the comfort of knowing that my online presence is enhanced without me running to my computer every morning at 8am to get my morning posts in. Plus, I can manage both of my Twitter accounts, and my Facebook account and pages from the same place. No logging out and re-logging in just to post one thing and move on.